Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/68478
標題: Using a Threading-Followed-by-Swelling Approach to Synthesize 2 Rotaxanes
作者: Ko, J.L.
Ueng, S.H.
Chiu, C.W.
Lai, C.C.
Liu, Y.H.
Peng, S.M.
Chin, S.H.
關鍵字: Cope rearrangement
NMR spectroscopy
rotaxanes
solvent-free synthesis
supramolecular chemistry
controllable molecular switch
template-directed synthesis
thermal
isomerization
cope rearrangement
rotaxanes
slippage
pseudorotaxane
macrocycle
complexes
anion
期刊/報告no:: Chemistry-a European Journal, Volume 16, Issue 23, Page(s) 6950-6960.
摘要: We have developed a "threading-followed-by-swelling" protocol to synthesize [2]rotaxanes efficiently and atom economically. Our protocol employs cis-1-[(Z)-alk-1'enyl]-2-vinylcyclopropane units as the termini of the threadlike components; these end groups are converted into more-sizable cycloheptadiene motifs, which function as stopper units, through Cope rearrangements at elevated temperature. We used this approach to synthesize [2]rotaxanes in good yield from [2]pseudorotaxanes featuring either one or two swellable termini to interlock three different types of macrocycle. The chiral centers created by the swelling process were "erased" by hydrogenating the cycloheptadiene termini into the corresponding cycloheptane units, affording achiral molecular [2]rotaxanes as the only final products.
URI: http://hdl.handle.net/11455/68478
ISSN: 0947-6539
文章連結: http://dx.doi.org/10.1002/chem.201000074
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